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My name is ***** ***** I am a Volvo dealership technician. I am going to try to help with your question today. You say the sound is intermittent- when does it occur?
Will it do it at idle?
How was it diagnosed as a clogged PCV?
Okay, thank you. I'm just trying to make sure it is indeed the PCV. I usually recommend pulling the oil dipstick slightly when the noise is occurring. If the noise stops, the PCV is at fault. If the PCV is clogged, there really isn't anything you can do to fix it aside from replacing it. The port in the engine block where the breather box drains should also be cleaned and verified to be clear into the oil pan.
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My name is ***** ***** I am a Volvo dealer technician. I am going to try to help with your questions today.
First, driving briefly to get home won't cause any other damage. Continuing to drive an extended period of time can cause damage to the catalytic converter.
Second, the difference in part numbers is just a new number. Part numbers change all the time.
If the code returned, then there is another problem causing the misfire. The compression in the cylinder would need to be checked and a cylinder leakdown test would probably need to be performed to see where any compression is being lost. How many miles are on the engine?
Sorry, that was meant for another question. Please disregard.